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Flickering with backbuffer usage[SOLVED]

 
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anmabagima



Joined: 01 Oct 2009
Posts: 96
PostPosted: Thu Oct 08, 2009 12:52 am    Post subject: Flickering with backbuffer usage[SOLVED] Reply with quote
Hi there,

i'm started the first PSP development in drawing some animated pixels to the PSP screen. I'm using draw buffer and backbuffer. After everything was drawn to the backbuffer I flip them. It's nothing really using GU and very simple. However, if I do NOT use sceDisplayWaitVblankStart(); the screen flicker, other wise it not flicker, but is very slow....

Here is my code snipped:
Code:

#define SCR_WIDTH (480)
#define SCR_HEIGHT (272)
#define PIXELSIZE   4            //in short
#define   LINESIZE   512            //in short
#define   FRAMESIZE   (SCR_HEIGHT * LINESIZE * PIXELSIZE)

Color* pg_vramtop = (Color *)(0x40000000 | 0x04000000);
bool pg_drawframe = true;


Color *pgGetVramAddr()
{
   if (pg_drawframe)
      return pg_vramtop + FRAMESIZE / sizeof(Color);
   else
      return pg_vramtop;
}

void setPixel(int x,int y, Color color)
{
     Color* vram = pgGetVramAddr();
     vram[x + LINESIZE*y] = color;
}

int main(int argc, char* argv[])
{
   Color* vram;
    // setup of common call backs
   setupCallbacks();
   // run the application
   while(running()){

     vram = pgGetVramAddr();
                  // clear the drawbuffer
     memset(vram, 0, FRAMESIZE);
//create some fancy pixels using setPixel()                 
                 Render();
                sceDisplaySetFrameBuf(vram, LINESIZE, PSP_DISPLAY_PIXEL_FORMAT_8888, PSP_DISPLAY_SETBUF_NEXTFRAME );
      pg_drawframe = pg_drawframe?false:true;
                //do not wait for Vblank start
                //sceDisplayWaitVblankStart();
   }
.....


The reoson why I do not want to use "sceDisplayWaitVblankStart();": It completely slows down everything ...

Any Ideas what may be wrong here ? Sorry that I'm just posting the code snippets, but I guess the kind of setting the pixels using some random method does not matter, doesn't it ?

Thanks in advance...
AnMaBaGiMa

Last edited by anmabagima on Thu Oct 08, 2009 4:38 pm; edited 1 time in total
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J.F.



Joined: 22 Feb 2004
Posts: 2906
PostPosted: Thu Oct 08, 2009 6:21 am    Post subject: Reply with quote
Your code snippet doesn't show the double-buffering you claim to be doing, just single buffering. Please post enough of the code that we can see how your program REALLY handles the buffers.
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anmabagima



Joined: 01 Oct 2009
Posts: 96
PostPosted: Thu Oct 08, 2009 6:39 am    Post subject: SOLVED Reply with quote
Hi,

I've solved it in using the Parameter PSP_DISPLAY_SETBUF_IMMEDIATE instead of PSP_DISPLAY_SETBUF_NEXTFRAME within
sceDisplaySetFrameBuf.

However, the double buffering is there:
Code:
Color *pgGetVramAddr()
{
   if (pg_drawframe)
      return pg_vramtop + FRAMESIZE / sizeof(Color);
   else
      return pg_vramtop;
}
points dependent of the flag "pg_drawframe" to two different addresses (buffers). The sceDisplaySetFrameBuf switches between these buffers...

Thanks.

Regards,
AnMaBaGiMa
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